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TH400 rebuild problems

Does anyone know why a seal would keep blowing out? Would it be a bad case? The seal is like a big O-ring. It is toward the rear of the tranny. The trans has been rebuilt three times now and it has done the same thing everytime. Almost everything is new inside. It slips a little but shifts fine from first to second, but when it goes to third it wants to go right back to second. I am getting tired of pulling it in and out. I thought about getting a new one from advance for $622 it is rebuilt by recon. Is this a bad idea? Any help is greatly appreciated.